Watch-demagnetizer.



No. 702,500. Patented lune I7, |902.

P. sonENsEN.

WATCH DEMAGNETIZER.

(Application led Jan. 9, 1902.)

(No Model.)

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UNITED STATES PATENT FFTCE.

PETER SORENSEN, OF BROKLYN, NEV YORK.

vVATCH-DEIVIAGNETIZER.

SPECIFICATION forming part of Letters Patent No. 702,500, dated June17', 1902. Application filed January 9, 1902. Serial No. 88,979. (Nomodel.)

.To all whom it may concern:

Be it known that I, PETER SORENSEN, a citizen of' the United States, anda resident of Brooklyn, in the county of Kings and State of New York,have invented certain new and useful Improvements inVVatch-Demagnetizers, of which the following is a specification.

My invention relates to the construction of that class of apparatus inwhich a watch or other article to be demagnetized is subjected to theaction of a rotating electromagnet.

The object of my invention is to provide a simple and cheap portableapparatus for this purpose and to so organize the same that the circuitof the battery used in charging the magnet may not be leftunintentionally closed when the apparatus is out of use.

The first part of my invention consists in the construction Vof anautomatic circuit closer and breaker, which is embodied in or mountedsuitably in the handle, by which rotation is imparted to the magnet, andis so constructed that in the act of taking hold of the handle theoperator may close the circuit of the battery, but will serve toautomatically open the circuit when the operator lets go of the handle.

My invention consists also in the novel organization and construction ofapparatus hereinafter more particularly described in connection with theacompanying drawings, in which a form of apparatus embodying myinvention is shownV in a vertical section through the containing-caseand the principal working parts.

Referring to the drawings, 1 indicates a suitable box or casing,preferably of wood, having a hingedcover 2 and carrying one or morecells of battery, preferably a dry battery, (indicated by the numeral3.) The elect1omagnet,wl1ieh is rotated in the operation 0fdemagnetizing the watch or other article, is indicated by the numeral 4,and consists, preferably, of Aa magnet of horseshoe form, mounted sothat its two opposite poles (indicated by the letters 'n s) may berotated in the plane parallel to the plane of lthe top or coverof thecasing and in close proximity to the upper surface thereof, for whichpurpose an opening 5is madein the cover, which open ing is preferablyclosed by a thin plate (i, that may be of brass or other non-magneticmaterial, fastened bypins or screws to the cover, as indicated. The twopoles n s are in close proximity to the under surface of said plate, andtherefore the lines of force maybe brought to bear closely upon anyobject laid upon the plate 6 and gradually moved away therefrom in thewell-known operation of rotating the magnet for rendering the magnetizedparts neutral.

The electromagnet 4 is mounted upon a vertical shaft 7, to which theyoke-piece of thc electromagnet is suitably secured. Said shaft rotatesin suitable bearings 8, formed in arms extending transversely from asuitable bracket 9, which is fastened bybolts or screws 11 to the sidewall of the casing and is provided, as shown, with a proper bearing orjournal box for the horizontal shaft 10, which is rotated in order torotate the electromagnet. The shaft 10 gears with shaft 7, carrying theelectromagnet, through gear-wheels 12 13, o ne secured to shaft 10 andthe other to shaft 7, as shown, and is provided on its end extendingthrough the wall of the casing with a crank 14, to which is secured thehandle 15. The handle 15, which is preferably of insulating material, isfastened to the crank 14 by a hollow screw 1G, set' iu a countersunkhole passing longitudinally through said handle, as clearly shown in thesectional view. Within said screw is a longitudinallymovable headedconductingpin 17, with 'which engages a transversely-movable button 1S,located in the head of the handle 15 and in position to be depressed bythe hnger of the operator when he rotates the shaft 10 by taking hold ofthe handle. The button 1S engages with the headed end of the pin 17 byan incline or cam, as clearly shown, and thereby forces the saineinwardly for the pu rpose of closing the circuit of the electromagnetet. .Vhcn the button 1S is relieved of pressure by the hand of theoperator, the pin is forced backward by a suitable spring and thecircuit is broken. The spring for this purpose may be eitheracoil-spring encircling the pin, as shown, and compressed between thehead of the pin aud the bottom of the opening in the hollow screw, or itmay be a spring 19, which is set in the crank 1-5L and ICO is engagedbythe inner end of said pin, so as to be forced thereby into contactwith the edge of a conducting ring or bushing 20, set in the openingthrough which the shaft l0 passes, or otherwise disposed around saidshat't so as to be engaged by the spring 1S) during rotation of thehandle 15 and crank la.

The circuit of the electromagnet is formed as follows: One end of thecoil of said magnctis attached toa conducting-ring 2l, which is fastenedupon the shaft 7, but insulated therefrom by a suitable bushing, asshown, while the other end of said coil is connected to the core or yokeof the electromagnet, so as to be in electrical connection with theshaft 7, and thence through the metal-work of the bracket and core withthe shaft lO, crank let, and pin and contact-springs l7 and 19. Upon thecontact-ring 2l bears a spring 2, fastened to a binding-post which issuitably supported upon the bracket or upon any other part of theapparatus and is properly insulated from said bracket. One terminal ofthe batteryT being fastened to the said binding screw and the otherbeing suitably connected with the conducting-ring 20, it is obvious thatwhen the button 1S is forced inwardly, so as to carry the contact-pininwardly toward the ring 20, the circuit ot' the battery through thecoils of the electromagnet will be closed and said magnet will beenergized, so as to afford the magnetism by which the watch or otherarticle is to be demagnetized through rotation of said magnet and thegradual removal of the watch or article from the field of magneticini'luence. When the operation ceases and the operator removes his handfrom the handle by which the device is rotated, the circuit of thebattery and electromaguet will be automatically opened through therecession of the circuit making and breaking pin in the handle, which isbrought about through the action of the spring and the relief ofpressure upon the button 1S.' It will be seen, therefore, that thecircuit at' the battery is not liable to be left unintentionally closedwhen the apparatus is not in use.

Nhat l claim as my invention isd l. ln a deinagnetizingapparatus, thecoinbination of a rotatable electromagnet, the shaft carrying the sameand having one end of the magnet-coil in electrical connection with it,the bracket of condu-cting material secured to a wall of the casing, aconducting-ring upon said shaft in electrical connection with the otherend of the magnet-coi1, a spring mounted upon an insulated supportcarried by the bracket and bearing upon said ring, a battery connectedwith one pole to said spring, and means for closing a connection fromthe other pole of the battery tothe supporting-brackct for the shaft.

2. In a demagnetizing apparatus, the combinationsubstantially asdescribed of a rotatable electromagnet, a battery for charging the same,an actuating-handle for rotating said magnet and an automatic circuitcloser and breaker mounted in the handle, an actuating-button mounted insaid handle for closing the circuit, and a spring for automaticallybreaking the circuit of said battery and electromagnet when the operatorlets go the handlc,'as and 'for the purpose described.

In a demagnetizing apparatus, the combin ation substantially asdescribed, of a rotating electromagnet, an actuating-handle secured tothe arm of the actuating-shaft, a hollow screw mounted in acountersunkopening in the handle and serving to secure the same to the crank, acircuit making and breaking pin passing longitudinally through saidscrew and handle, and an actuatingbutton therefor mounted in atransverse opening in the handle.

.t. The combination substantially as dem scribed with a crank l-iconnected to one pole of an electric circuit through the shaft carry"ing the same, a stationary ring or collar JO surrounding said shaft andconnected to the other pole of the circuit, means for making andbreaking electrical connection between the crank and the ring, anactuating -pin therefor mounted in a longitudinal opening passingthrough the handle and crank, an actu atin g-button mounted in atransverse opening in said handle for actuating the pin in a directionto close the circuit, and a suitable spring for operating the pin in theother direction to open the circuit, all as described, whereby duringrotation of the shaft the circuit will be automatically maintained byrotating contact with the ring 20, while the circuit will beautomatically opened when the operator lets go of the handle.

5. The combination substantially as described of the crank Lt, shaft l0,ring 20, han die l5, hollow screw 16 'fastening said handle to thecrank, a longitudinally-1novable pin therein, a spring adapted to engagewith ring 2O and bearing against one end of the pin, and anoperatingbutton 1S engaging with the opposite end of the pin.

(3. In a demagnetizing apparatus, the combination substantially asdescribed of the rotatable electromagnet or shaft carrying the same andprovided with an insulated conductiiigiiiig to which one end of themagnet-coil is secured, the transverse operating-shaft 10 passing'through the wall of the casing and surrounded by conducting-ring 2Ofixed in said wall, a suitable bracket 9 provided with bearings 'forsaid. shaft, contact-spring 22 cngaging the ring 2l but insulated fromthe bracket, and an actuatingcrankin electrical connection with theshaft and bracket and carrying contact devices whereby continuousconnection may be maintained with ring 20, to maintain the circuit ofthe elcctromagnet during rotation of the same.

7. The combination su stantially as described of a battery, a casing, arotatable shaft within said casing, an actuating-handle for rotatingsaid. shaft and an automatic circuit IOC closer and breaker mounted inthe handle, an New York and State of New York, this 7th actuating-buttonmounted in said handle for day of January, A. D. 1902.

closing the circuit, and t spring` for automatioally breaking,` thecircuit of said battery 13E/1ER SORENSEN' when the operator lets go thehandle, as and for the purpose described. Signed at New York city, inthe County of i Witnesses:

H. C. TOWN-SEND, E. L. LAWLER.

